Pressure regulator



FIG. 1 is a perspective view of the front, right side and top of a pressure regulator showing an embodiment according to the new ornamental design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a perspective view of the front, right side and bottom thereof.

The broken lines within the Figures show portions of the pressure regulator which form no part of the claimed design. 

CLAIM The ornamental design for a pressure regulator, as shown and described. 